JP2000052085A - High performance super high pressure cutting tool of brazing type composed of diamond group super high pressure sintered compact and substrate hard metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high performance super high pressure cutting tool of a brazing type composed of a diamond group super high pressure sintered compact and a substrate hard metal. SOLUTION: A cutting blade piece composed of a diamond group high pressure sintered compact material containing 1-20 vol.% one or more kind of TiC, TiN, and TiCN is directly brazed to a cutting blade piece brazing part of a tool main body composed of a tungsten carbide group hard metal containing the tungsten carbide as a main component via a Au alloy brazing material having a composition containing, at wt.%, 20-40% Cu, 0.5-10% Ti, and the balance of Au and inevitable impurities.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a cutting blade made of a diamond-based ultra-high pressure sintered body made of a tungsten carbide-based cemented carbide containing tungsten carbide as a main component via an Au alloy brazing material. And a high-performance ultra-high pressure cutting tool directly brazed to a brazing portion of a cutting blade of a cutting tool body.

[0002]

2. Description of the Related Art Conventionally, a cutting piece made of a diamond-based ultra-high-pressure sintered body is attached to a brazing portion of a cutting tool piece made of a tungsten carbide-based cemented carbide containing tungsten carbide as a main component. % By weight (hereinafter,% indicates weight%), for example, Cu: 29.7%, Zn: 28.1
%, Ni: 2.0%, and an ultra-high pressure cutting tool brazed with an Ag alloy having a typical composition consisting of Ag and unavoidable impurities with the balance being Ag is widely known. Continuous or intermittent cutting of cast iron, Al alloy, and copper infiltrated Fe-based sintered materials, as well as drilling and through holes, as brazing materials for cutting tools such as chips), drills, end mills and reamers. It was also known as a tool for cutting, such as machining and end face machining of plate materials.

[0003]

On the other hand, in recent years, the performance of cutting equipment has been remarkably improved, and there is a strong demand for labor-saving cutting. Accordingly, there is a tendency to increase the speed even in heavy load heavy cutting. However, in a cutting tool brazed using the above-mentioned conventional brazing material, when used under high-speed cutting conditions, the joining strength between the cutting edge layer and the base layer of the WC-based cemented carbide is insufficient. For this reason, peeling from this portion is apt to occur, and at present, the service life is reached in a relatively short time.

[0004]

Means for Solving the Problems Accordingly, the present inventors have
From the above viewpoint, a cutting edge piece made of a diamond-based ultra-high pressure sintered body is firmly attached to a brazing portion of the cutting edge piece of a tool body of a WC-based cemented carbide without peeling even during high-speed cutting. As a result of research to develop a cutting tool having a high joining strength, by using an Au alloy brazing material containing Au as a main component, an excellent brazing joining strength is provided between the tool body and the cutting blade. Will be secured and therefore
The research result shows that the cutting tool obtained as a result exhibits excellent cutting performance over a long period of time without peeling of the cutting edge piece even when used for high-speed cutting.

The present invention has been made on the basis of the above-mentioned research results, and is based on a cutting blade made of a diamond-based ultrahigh-pressure sintered material, which is obtained by adding Cu: 20 to 40% by weight, Ti: Of a tool body made of a tungsten carbide-based cemented carbide containing tungsten carbide as a main component through an Au alloy brazing material containing 0.5 to 10% and a balance of Au and inevitable impurities. An ultra-high pressure cutting tool excellent in high speed cutting performance, which is characterized by being directly brazed to a cutting edge piece brazing portion.

In the present invention, since the Au alloy brazing material having a higher melting point than the conventionally used Ag alloy brazing material is used, the brazing temperature can be set higher, and as a result, a better bonding strength can be obtained. Can be done.

Further, in the present invention, the diamond-based ultrahigh-pressure sintered material, which is a cutting piece, contains a Ti component, and the brazing material used is Au, which also contains a Ti component.
Since it is made of an alloy, the adhesiveness between the cutting piece and the brazing part of the cutting piece of the tool body made of tungsten carbide based cemented carbide as the base is further improved, and stronger bonding strength can be obtained. , And can exhibit cutting performance at higher speed.

[0008]

Embodiments of the present invention will be described below. First, for the purpose of manufacturing a tool body, WC powder, TaC powder, (Ti, W) each having a predetermined average particle size in the range of 0.5 to 10 μm are used as raw material powders.
Using C [weight ratio, TiC / WC = 50/50] powder and Co powder, these raw material powders are blended in a predetermined constant composition, wet-mixed in a ball mill for 72 hours, dried, and dried to 1 ton. / Cm ^{2 at} a pressure of 1 × 10 ⁻³ torr, and holding these compacts at a predetermined temperature in the range of 1350 to 1450 ° C. for 1 hour in a vacuum of 1 × 10 ⁻³ torr. Sintering, and machining of the sintered body to produce a chip body, drill body, end mill body, reamer body, etc., each having a predetermined shape, all made of WC-based cemented carbide. did.

[0009] For the purpose of producing cutting blades, as raw material powders, diamond powder having a predetermined average particle size within the range of 6 to 12 µm and purity of 99.95% and 0.5 to 90% are used.
Using 2 μm of TiC powder, TiN powder, TiCN powder and Co powder, these raw material powders are blended in a predetermined composition, wet-mixed in a ball mill for 72 hours, and dried.
It is pressed into a green compact having a predetermined shape at a pressure of 3 ton / cm ² , and these green compacts are charged into a usual belt-type ultra-high pressure sintering apparatus, and are pressed at a predetermined pressure within a range of 5 to 6 GPa to 135.
Sintering is performed at a predetermined temperature within a range of 0 to 1500 ° C. for 30 minutes to form a sintered body made of a diamond-based sintered material having a predetermined size, and wire-electric discharge machining is performed. Using a machine, a cutting blade for a chip, a cutting blade for a drill, a cutting blade for an end mill, a cutting blade for a reamer, and the like having predetermined dimensions were respectively manufactured.

Further, a molten alloy having a predetermined component composition is prepared by using a normal melting method, and cast into an ingot under normal conditions, and subjected to hot rolling and cold rolling to obtain a thickness. : A brazing filler metal for a cutting tool of the present invention and a conventional brazing filler metal for a cutting tool of 0.35 mm were produced.

Next, the above-mentioned various cutting blade pieces are set in an appropriate combination to the respective cutting-blade brazing portions of the above-mentioned various tool bodies in a state where the brazing material of the present invention is sandwiched in an appropriate combination. 950 in a vacuum of 1 × 10 ⁻³ torr
A chip 1 using the brazing material for a cutting tool of the present invention by brazing at a temperature of 5 ° C. for 5 minutes, a drill using the brazing material for a cutting tool of the present invention, an end mill using the brazing material for a cutting tool of the present invention And a cutting tool of the present invention comprising a reamer using the brazing filler metal for the cutting tool of the present invention.

Next, the reason why the component composition of the Au alloy brazing material for the cutting tool of the present invention is limited as described above will be described. (A) Cu The Cu component has a function of remarkably improving the breaking strength of the brazed portion and of increasing the fluidity of the brazing material to improve the brazing property. If the content is less than 20%, The desired effect cannot be obtained in the above-mentioned action, while the content is 40
%, The breaking strength of the brazed portion tends to decrease, so the content is determined to be 20 to 40%, preferably 25 to 35%. (B) Ti The Ti component has the effect of further improving the wettability with respect to the cutting piece composed of a diamond-based or cBN-based sintered material. The desired effect is not obtained, while the content is 10%
If it exceeds, the strength of the brazed portion is reduced. Therefore, the content is determined to be 0.5 to 10%, preferably 1 to 5%.

[0013]

EXAMPLES Examples of the present invention will be specifically described below. First, for the purpose of manufacturing a tool body, WC powder, TaC powder, (Ti, W) C having a mean particle size shown in Table 1 [TiC / WC = 50 /
50] Using a powder and a Co powder, these raw material powders were blended in the same composition as shown in Table 1, wet-mixed in a ball mill for 72 hours, dried, and then dried at 1 ton / cm.
Pressed into green compacts of a predetermined shape at a pressure of ² and sintering these green compacts in a vacuum of 1 × 10 ⁻³ torr at the respective temperatures shown in Table 1 for 1 hour, By machining the sintered body, all are made of a WC-based cemented carbide and have the shape (thickness: 3.18) of CIS standard TNGA332.
(mm × one side length: equilateral triangle of 16 mm), tip bodies A-1 to A-3 having a diameter of 12 mm, and two-blade drill bodies A-4 to A-5 having a diameter of 12 mm, and two blades having a diameter of 12 mm. End mill body A-6 to A-7 with a shape, and diameter: 6 mm
The single-blade reamer bodies A-8 to A-10 were respectively manufactured.

[0014]

[Table 1]

Further, for the purpose of manufacturing cutting blade pieces, diamond powder having a purity of 99.95%, TiC
Using powder, TiN powder, TiCN powder and Co powder, these raw material powders were similarly blended in the composition shown in Table 2, wet-mixed in a ball mill for 72 hours, dried, and then dried under a pressure of 3 ton / cm ² . Pressed into green compacts of a predetermined shape, these green compacts were charged into a normal belt type ultra-high pressure sintering apparatus, and sintered at the respective pressures and temperatures shown in Table 2 for 30 minutes. Then, diameter: 20 mm x thickness: 1.
A sintered body made of a diamond-based sintered material having a size of 5 mm was formed, and this was formed using a wire-electric discharge machine.
Equilateral triangular cutting edge piece B with a side length of 5 mm
1 to B-3, radius: 3.5 mm x central angle: 120 degree fan-shaped cutting blade pieces B-4 to B-5, vertical: 6 mm x
Horizontal: 1.5mm rectangular cutting edge piece for end mill B-
6 to B-7, and fan-shaped reaming blade pieces B-8 to B-10 each having a radius of 3 mm and a central angle of 90 degrees were produced.

[0016]

[Table 2]

Further, a molten alloy having the component composition shown in Table 3 was prepared by a normal melting method, cast into an ingot under normal conditions, and subjected to hot rolling and cold rolling. Brazing material C for cutting tools of the present invention having a thickness of 0.35 mm
-1 to 12 and the conventional brazing material C-13 for a cutting tool were manufactured.

[0018]

[Table 3]

Next, the above various cutting blade pieces B-1 to B-10
With the combinations shown in Table 4, the various tool bodies A-
For each of the brazing sections 1-10, shown in Table 4.
Each of the brazing materials C-1 to 10 of the present invention is sandwiched by a combination.
1x10 ^-395 in torr vacuum
By brazing at 0 ° C for 5 minutes
The cutting tool chips 1 to 3 of the present invention (hereinafter simply referred to as the chip of the present invention)
Drills 1 and 2 for cutting tools of the present invention (hereinafter referred to as
Below, simply referred to as drills 1 and 2 of the present invention), cutting tool of the present invention
End mills 1 and 2 (hereinafter simply referred to as the present end mill 1,
2), reamers 1 to 3 of the cutting tool of the present invention (hereinafter simply referred to as “reamers”).
Of the present invention).

[0020]

[Table 4]

For the purpose of comparison, each tool body A-
1 to 10, each cutting blade piece B-1 to 10 was prepared, and Cu:
29.7%, Zn: 28.1%, Ni: 2.0%, Ag
In a state where the conventional brazing filler metal as the unavoidable impurities is sandwiched between the cutting edge piece brazing portions of the respective tool bodies A-1 to 10, the respective cutting edge pieces B-1 to 10 are combined as shown in Table 5, and Conventional chips 1-3, conventional drills 1,2, conventional end mills 1,
2 and conventional cutting tools including conventional reamers 1 to 3 were manufactured, respectively.

[0022]

[Table 5]

Next, regarding the obtained chips 1 to 3 of the present invention and the conventional chips 1 to 3, the work material is ordinary cast iron (FC300, HB200), and the cutting speed is 300 m / min. Feed: 0.1 mm / rev. Cutting: 0.1 mm Cutting time: 20 minutes A dry continuous high-speed cutting test of ordinary cast iron FC300 was performed under the following conditions. For drills 1 and 2 of the present invention and conventional drills 1 and 2, work material: Al alloy containing 12% Si Sheet thickness: 30 mm, cutting speed: 300 m / min. Feed: 0.3 mm / rev. Notch: Through hole with pilot hole diameter 10mm (machined pilot hole diameter 12m)
m) A dry high-speed drilling test of a Si-containing Al alloy was carried out under the condition of the number of drilling: 500 holes. 5 mm plate material, Cutting speed: 100 m / min. Feed: 0.05 mm / rev. Cutting: End processing of plate material Cutting time: A dry high-speed end processing cutting test of a copper alloy was performed under the conditions of 60 minutes. Further, for the reamers 1 to 3 of the present invention and the conventional reamers 1 to 3, Plate thickness of a copper infiltrated pure iron sintered material (Rockwell hardness B scale: 80): 50 mm, Cutting speed: 50 m / min. Feed: 0.16 mm / rev. Notch: pilot hole diameter: 5mm through hole (machining hole diameter: 6m
m) A high-speed dry hole drilling test was performed on the copper infiltrated pure iron sintered material under the condition of the number of cuts: 1000 holes, and the maximum wear width of the cutting piece (cutting layer) was measured in each cutting test. Tables 4 and 5 show the results of these measurements.

[0024]

As is clear from the results shown in Tables 4 and 5, the cutting tools of the present invention (tips 1 to 6 of the present invention, drills 1 to 4 of the present invention, end mills 1 to 4 of the present invention, and
In each of (1) to (6), since the cutting edge piece is brazed to the tool body with a strong joining strength, the cutting edge piece shows normal wear without peeling even in high-speed cutting of various work materials, While exhibiting excellent wear resistance, conventional cutting tools (conventional inserts 1-3, conventional drills 1,2, conventional end mills 1,2)
In addition, it is apparent that in all of the conventional reamers 1 to 3, peeling occurs at the joint surface between the cutting layer and the base layer of the cutting blade piece, and the service life is relatively short. As described above, in the cutting tool of the present invention, the cutting edge piece is firmly brazed directly to the tool body, so that the cutting tool piece can be cut not only under normal conditions but also in high-speed cutting. Without peeling
Excellent cutting performance is exhibited over a long period of time.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) C04B 37/02 C04B 37/02 B C22C 29/08 C22C 29/08 F term (reference) 3C046 FF35 FF40 FF55 GG01 HH05 HH06 4G026 BA13 BB21 BF17 BF24 BG02 BH01

Claims (1)

[Claims] 1. A cutting blade composed of a diamond-based ultrahigh-pressure sintered material containing 1 to 20 vol% of one or more of TiC, TiN and TiCN, in weight%, Cu: 20 to 40 %, Ti: 0.5 to 10%, and the remainder is made of a tungsten carbide-based cemented carbide containing tungsten carbide as a main component via an Au alloy brazing material having a composition of Au and inevitable impurities. A high-performance brazing-type ultra-high-pressure cutting tool comprising a diamond-based ultra-high-pressure sintered body and a base cemented carbide, which is directly brazed to the brazing portion of the cutting edge of the tool body.